:-)) sorry Tom I couln't resist the "dig" but it looks like the result was
interesting and a little unexpected ! its always better to measure it
yourself, where possible, than rely on datasheets which can sometimes be
quite "imaginative"
Well done
Alan
----- Original Message -----
From: "Tom Bales" <t...@starhouse.org>
To: "time-nuts" <time-nuts@febo.com>
Sent: Monday, September 16, 2013 6:21 PM
Subject: [time-nuts] Lightning Strike Site, Latency of AS3935 IRQ output
Alan,
Well, you shamed me into actually setting it up and measuring the IRQ
delay. Amazingly, the delay varies from 25 to 110 milliseconds, depending
upon what type of triggering is involved. I did the test using their
"lightning simulator" and measuring the delay between the magnetic pulse
the simulator creates and switching of the IRQ line. Makes you wonder
what
a little processor could possibly be doing for a whole tenth of a second.
Tom Bales
Message: 3
Date: Tue, 10 Sep 2013 00:34:49 +0100
From: "Alan Melia" <alan.me...@btinternet.com>
To: "Discussion of precise time and frequency measurement"
<time-nuts@febo.com>
Subject: Re: [time-nuts] Lightning Strike Site (Jim Lux)
Message-ID: <EF06D912BDF74BE6BE916C3088B7F68B@gnat>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=response
Come on fellas it can't be that difficult to input a pulse to the chip and
measure the prop delay to the INT pin ....this is timenuts after all :-))
Alan
G3NYK
----- Original Message -----
From: "Jim Lux" <jim...@earthlink.net>
To: <time-nuts@febo.com>
Sent: Tuesday, September 10, 2013 12:08 AM
Subject: Re: [time-nuts] Lightning Strike Site (Jim Lux)
On 9/9/13 3:52 PM, Mark Sims wrote:
The AS3935 has an INT output pin that signals a detection. You could
monitor that. The AS3935 is based upon an internal DSP processing the
receiver output. No telling how long between when the strike occurs and
when INT is activated.
I'd send a nice note to the folks in Austria who make the part and ask
them.
I suspect, also, that you might be able to figure out some other
lightning
sensor electronics: the Boltek unit wasn't all that complex, looking at
the PC board, but I didn't have a schematic.
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